Bendix Commercial Vehicle Systems C-300N HYDRAULIC POWER STEERING1/99 User Manual
Page 29
29
4. Repeat Step 3 - turning the steering wheel in the opposite
direction.
5. With the engine off remove the pressure relief test plug
assembly (106773). Reinstall the spring (43). Install a
new (unused) sealing washer (44) on the pressure relief
valve plug (42) then install the adjusting shims (41) in
the plug. Install the plug (42) in the valve body(7) and
torque to 66-73 pound feet.
IMPORTANT:
Step 5 must be completed before placing the vehicle back
in service.
TECHNICAL DATA
C-300N C-500N
Steering ratio
(input to output shaft)
21.2:1
21:1
Steering wheel revolutions for
90° rotation of output shaft
5.3
5.25
Maximum output
shaft rotation (Note 1)
95° Max. Travel
90
Maximum output
shaft torque with 1992 p.s.i.
1985 lb. ft.
3767
(140 Kg/C M2) power assist(270 mdaN)
(510)
Power steering fluid
DEXRON 11 ATF
Maximum working temperature
248°F (120°C)
Maximum peak temperature
302°F (150°C)
Maximum allowable pressure
See Note 2
(144 Kg/C M2)
Maximum pressure drop
in the return line
See Note 3
Maximum normal flow
See Note 3
Note 1: Maximum rotation is specified, maximum power
assisted rotation is less when steering limiting
optional feature is incorporated.
Note 2: Maximum working pressure is determined by the
pressure setting of the pressure relief valve when
that optional feature is incorporated. Maximum
allowable pressure for the C-300N is 2102 psi (145
bar) and for the C-500N is the same.
Note 3: The pressure drop and flow rate are interrelated
and application specific. Consult the vehicle
manufacturers maintenance manual for this
information.
TROUBLESHOOTING
PRELIMINARY CHECKS
Before proceeding to the troubleshooting headings, it is
strongly recommended that some preliminary checks be
made and a test ride be taken to eliminate unnecessary
work.
1. Check for proper and equal tire inflation on the steering
axle. Note any abnormal tire wear which may be
attributable to front end alignment.
2. Make certain the power steering reservoir oil level is
correct.
3. Make certain the power steering pump belt is not slipping.
4. Visually inspect the following components for obvious
damage, misadjustment and possible binding.
A. steering column and universals or couplings.
B. steering arms, tie rods, tie rod ends and knuckles.
C. general looseness in the steering linkages.
5. Check hoses for sharp bends, kinks and proper
size.
The most common faults may be grouped under the following
headings:
1. Power steering does not operate.
2. The power steering is stiff in one direction and normal in
the other.
3. The power steering tends to turn itself when the engine
is started.
4. Excessive free play at the steering wheel.
5. The power steering operates normally but is intermittently
hard.
6. Oil leaks.
7. The power steering is stiff when turning the steering wheel
quickly.
8. The power steering does not return correctly.
9. The power steering operates but with noise, turbulence
or vibration.
TORQUE CHART
Item
C-300N
C-500N
Valve Body Bolts (Item 40)
81-88 Pound Feet
92-99 Pound Feet
Side Cover Bolts (Item 49)
81-88 Pound Feet
92-99 Pound Feet
Side Cover Adjusting Screw Lock Nut (Item 32)
74-78 Pound Feet
74-78 Pound Feet
Valve Body Valve Nut (Item 1)
221-257 Pound Feet
221-257 Pound Feet
Steering Limiting Valve Seat (Item 17)
8-11 Pound Feet
8-11 Pound Feet
Pressure Relief Valve Seat (Item 48)
15-18 Pound Feet
15-18 Pound Feet
Pressure Relief Valve Plug (Item 42)
66-73 Pound Feet
66-73 Pound Feet
Drain Plug (Item 54)
37-47 Pound Feet
37-47 Pound Feet